Ti44Al6Nb合金在定向凝固过程中的组织变化行为分析  

Analysis on Structure Changing Behavior of Ti44Al6Nb Alloy in Directional Solidification Process

作　　者：李洁[1,2] 

机构地区：[1]华北电力大学控制与计算机工程学院 [2]保定职业技术学院

出　　处：《铸造技术》2014年第12期2964-2966,共3页Foundry Technology

摘　　要：以Ti44Al6Nb合金为研究对象，采用多功能电磁冷坩埚定向凝固设备，利用改变抽拉速率和加热功率来控制凝固界面前沿的生长速率和温度梯度，研究定向凝固过程中的组织演变行为规律。结果表明，随着抽拉速率的不断变大，Ti44Al6Nb合金表面质量呈先变差再变好的趋势，随加热功率的升高其表面质量变好。晶粒尺寸随抽拉速率的变大而不断变大，随加热功率的升高晶粒明显变小。其初始凝固相有α相和β相两种。Taking Ti44Al6Nb alloy as research object, the growth rate and temperature gradient of the forefxont of solidification interface were controlled by changing withdrawal rate and heating power, the law of structure evolution behavior was analyzed. The results show that, with the increase of withdrawal rate, the surface quality of Ti44Al6Nb alloy is first poor and then becomes better; with the increase of heating power, its surface quality becomes better. With the increase of withdrawal rate, the grain size becomes larger and larger. With the increase of heating power, the grain size becomes significantly smaller. The initial solidified phases have α phase and β phase.

关 键 词：定向凝固 抽拉速率 加热功率 

分 类 号：TG146.23[一般工业技术—材料科学与工程]